Dish-washing machine.



J. T. McGRATH.

DISH WASHING MACHINE.

APPLICATION FILED JUNE 19, 1914.

1,142,187, Patented June 8, 1915.

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DISH WASHING MACHINE.

APPLICATION FILED JUNE 19, 191+ Patented June 8, 1915.

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JOHN- THOMAS mourn, or anoo urnprron,

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specification of Letters Patent. I

. ia e ed JF RQn121 App1ication fiIed -June 19,1914. -Se r1a11io.e-iaeas.

marked thereon, which form a part of this specification.

This invention relates to improvements in dish washing machines, andrefers principally' tothat type of machines embracing a casing toreceive and hold the wash'water, a dish basket supportedtherein and oneor more spray pipes for spraying the wash water upon and among thedishes supported in the basket, with suitable means for forcing the washWater into and through the spray pipes. I

Among the objects of the invention 15 to provide a construction in dishwashing machines of this character which, while adapted to hotel andrestaurant uses, isalso sufliciently simple and economical inconstruction to be adaptable to household uses.

A further object of the invention 1s to provide a novel means fordirecting the wash water to the receptacle which carries the dishes, soarranged that the water is dashed upon and among the dishes in thebasket under considerable pressure, and also arranged to cut oil thewash water from the spray pipe or pipes when the device is not inoperation.

A further object of the invention 1s to provide a spray pipe arrangedabove the dish basket and supported on the hinged or swinging cover ofthe casing in suchmanner that the spray pipe may be swung upwardly awayfrom the casing with the cover to permit the dish basket to be removedthrough the open top of the casing.

A still further object of the invention is to provide an improved meansfor separating from the wash water the particles relioamoved from thedishes prior to the reintroduction of the wash Water to the pump of thewater-circulating system.

Other objects of the invention are to improve and simplify machines ofthis general character, and the inventionconsists in the matters:hereinafter set forth andmorepar tieularly pointed out in the appendedclaims.

the drawin :Fi gure -1 is a transverse vertical. section of a dishwashing machine embodying my invention. Fig. 2 is -'a longitudinalvertical section thereof. Fig.

Sisaplan view of the machine withthe-lid orcover-removed. Fig. lis af-ragmentary axial section:illustrating the construction of the spraypipe-and-the valve-forcontrolling the-flow of .water therefrom. Fig.5,is a fragmentary plan view illustrating a stop carried-by the valvesleeve to'limit its movemen As shown in the drawings, 10 designates theinclosing casing of the disk washing machineto .receive and hold thewash water. Said casing, in the present embodiment of thev invention, ismade of oblongmectangular shape, and is supported at itsfront and rearends on legs or standards 11, 11. The casing is provided with aswingingttop or lid 12 that is hinged at one edge at '13 to one sidewall of the casing, and is provided at its other edge with a lockinglatch 14 to lock the coverv closed.

Arrangedwithin the casingis a basket 15 to receive and hold the dishesto be washed. Said basket, as herein shown, is made of wire netting andis supported on horizontal girders 16, 16 extending transversely betweenthe side walls of the casing and attached to said .side walls in anysuitable manner. The basket is open at its top, and.

the top edges of theside and end walls there of may be strengthened by abinding strip 18. It is of oblong rectangular. shape in plan tocorrespond with theshape of the casing. The basket is of .suchdimensions that it may be readily removed from the easing whentheswinging lid or cover is raised.

The means for delivering the wash water to the basket 15 consist,asvherein shown, of a centrifugal pump 20, that is mounted-in a chamberor well 21 formed at one end of the casing 10 below the level of thebottom wall 22 of the casing and toward-which chamber or well saidbottom wall 22 is inclined to direct the water to the well. The intakeof the pump is submerged in the water in said well. The eduction pipe 23of the pump extends upwardly toward the top of the easing and isconnected at its upper end with a header pipe 26 which is arrangedparallel to one side wall of the casing'ne'ar the top 119 thereof.Connected to said header pipe are a plurality ofspray pipes 27 27disposed at right angles to the header, and arranged horizontally overthe dish basket 15. The said header-pipe 26 may be supported at its endremote from the pump eduction pipe 23 by a suitable hanger 28 suspendedfrom the swinging lid. It is connected to the eduction pipe 23 throughthe medium of a ro tative joint or union 30, whereby said spray pipes27, which are supported on the lid, may be swung upwardly with the lid12 about the axis of said rotative joint 30. The said spray pipes areprovided with a plurality of relatively small discharge openings 31 atthe lower sides thereof. The passage of water through the said dischargeopenings is controlled by a valve mechanism that is so arranged andconstructed as to maintain the spray pipes closed until a predeterminedpressure isinduced therein from the pump 20, so that when the pipes areopened the discharge of water into the basket upon the dishes iseifected with considerable pressure. The valve means herein shown toeffect this result is made as follows: 35 designates a valve sleevewhichsurrounds and closely fits each spray pipe 27. The sleeve is closedat its outer end by an end wall 36. Extending no Iloosely through anopening in said end wall is a bolt 37 that is screw-threaded orotherwise fixed to the end wall 38 of the spray pipe. Interposed betweenthe end wall 36 of the valve sleeve and a head 39 of the bolt L86 lis acompression spring 40 which acts on the sleeve to hold the ports 41thereof out of register with the spray apertures or ports 31 of thespray pipe. The said end wall 38 of the spray pipe is provided with oneor jmore openings 42 which permit water to pass from said pipe into apressure chamber 45 of the valve sleeve between the end walls of saidsleeve and spray pipe.

The valved spray pipes are supported from the lid or cover 12 by meansof hangers 47 suspended from the lid and engaging the outer ends of thespray pipes. In a construction where the hinges of the rotative jointbetween the header 26 and the eduction pipe 23 are not co-axial with thehinge of the cover 12, the said spray pipes with their valve sleeves maybe movably supported in the hangers 47, or otherwise 'movably supportedon the cover, so as to permit the cover to move relatively to the spraypipes when the cover is swung on its hinges. In order to lessen suchrelative movement of the cover to the spray pipes, I may hinge the coverto an overhanging ledge 50 of the side walls of the casing 10, so as tothereby bring the hinge axes of said parts closer together.

The centrifugal pump 20 is driven from a power shaft 52 that isrotatively mounted on a bearing 53 carried by a standard 54 that 08rises from the adjacent supporting leg frame and lies against the endwall of the casing. Saidcrank shaft is provided with a large wheel55which is connected by a belt 56 to a small belt wheel 57 attached to theshaft 58 of the centrifugal pump. The said operat-' ing shaft 52 may berotated by hand or power mechanism and is herein shown as provided witha crank by which to rotate it.

In the operation of the machine the casing is charged with a body ofheated water sulficient to immerse the pump 20. This water may becharged with soap, if desired. Thereafter the dishes are placed in thereceptacle and the operating shaft 52 is rotated to operate the pump. ISaid pump acts to lift the water from the well 21 and force 1t into thespray pipes. When the pressure in the spray pipes is sufficient toovercome the strength of the springs 40, the valve sleeves are movedoutwardly to bring the ports thereof into register with the sprayopenings 31 of the discharge pipes, whereupon water is forced withconsiderable pressure upon the dishes or other articles to be washed.The water continues to be discharged from the spray pipes as long as thevalve operating pressure is maintained by the pump. When the operationof the pump ceases, the springs 40 act on the valve sleeves to returnthem to their closed positions. The

said valves, arranged as described, constitute means to insure thedischarge of the water upon the dishes at a predetermined pressure, andthis pressure may be varied by adjustment of the bolt 37 which, beingscrew-threaded to the spray pipe, is capable of such adjustment.

In order to separate the larger particles, washed from the dishes fromthe water, after passing through the basket and before itsreintroduction into the pump, I may provide at the bottom of the casing,near the pump well2l thereof, a removable pan 60 which is seated in atransverse depression 61 at the foot of the inclination of the bot tomwall. The side wall 62 of said pan 60 adjacent to the well isperforated. The well is separated from the casing at the bottom thereofby an upstanding plate 63 which extends at its upper edge slightly abovethe bottom of the dish basket. The said plate 63 is also perforated soas to permit the water which flows down the inclined bottom wall intothe pan to pass into the well, while in the normal closed positionthereof, to engage and be held by shoulders 66 on the spray pipes, andadapted, in the open posistood that the invention is not intended to belimited to such details, except as such details are hereinafter secifically claimed, and as imposed by the prlor art.

I claim as my invention 1. A dish washing machine comprising areceptacle for the wash water, a dish basket therein, a spray pipe fordischarging water on the dishes in the basket, means to force the washwater through said pipe and onto the dishes, and valve means controlledby the pressure of wash water adapted to open upon a predeterminedpressure in the spray pipe to deliver water on the. dishes.

2. A dish washing machine comprlsmg a receptacle for the wash water, adish basket therein, a spray pipe for discharging water on the dishes inthe basket, means to force the wash water through the spray pipe andonto the dishes, valve means controlled by the pressure of the washwater adapted to open upon a predetermined pressure in the spray pipe todeliver water on the dlshes, and adjusting means to vary the pressure atwhich the water is discharged from said spray pipe.

3. A dish washing machine comprising a receptacle for the wash water, adish basket therein, a spray pipe for discharging water on the dishes inthe basket, means to force wash water through the spray pipe on thedishes, said pipe being provided with spray openings, a valve sleevefitted thereover and movable thereon and provided with ports adapted bymovement of the sleeve to be brought into register with the spray pipedischarge openings, and means controlled by the pressure of water withlnthe spray pipe to shift said valve sleeve to its open position.

4. A dish washing machine comprising a receptacle for the wash water, adish basket therein, a spray pipe for discharging water on the dishes inthe basket, means to force wash water through the spray pipe on thedishes, said pipe being provided with spray openings, a valve sleevefitted thereover and movable thereon and provided with ports adapted bymovement of the sleeve to be brought into register with the spray pipedischarge openings, yieldin means to normally hold the valve sleeve 1nits closed position, and means acted upon by the pressure within thespray pipe to move the valve sleeve to its open position.

5. A dish washing machine comprising areceptacle for the wash water, adish basket therein, a spray pipe for dischargingwater on the dishes inthe basket, means to force wash water through the spray pipe on thedishes, said pi e being provided with spray openings, a va ve sleevefitted thereover and movable endwise of the pipe and provided with alongitudinal series of ports adapted to register with said dischargeopenings, :1. spring acting to normally hold the valve sleeve in itsclosed position and means acted upon by pressure within the spray pipeto shift the valve sleeve to its open position against the action ofsaid spring.

6. A dish washing machine comprising a receptacle for the wash water, adish basket therein, a spray pipe for discharging water on the dishes inthe basket, means to force wash water through the spray pipe on thedishes, said pipe being provided with a Iongitudinal series of sprayopenings,a valve sleeve fitted thereon and movable endwise to limit theopening movement of the valve sleeve, and prevent overthrow thereof.

7. A dish washing machine comprising a receptacle for the wash water, adish basket therein and means for spraying wash water on the dishes inthe basket, comprising a spray pipe provided with a longitudinal seriesof spray openings and at one end with an end wall, a water lifting pumpcommunicating with the other end of said spray pipe, a valve sleevesurrounding said spray pipe and movable endwise thereof and providedwith ports to register with said spray openings, said valve sleeve beingprovided with a closed end wall between which and the end wall ofthespray pipe is formed a pressure chamber, the end wall of the spraypipe being perforated to permit passage of water from the spray pipe tothe pressure'chamher and yielding means acting on the valve sleeve tonormally hold said sleeve in its closed position.

8. A dish washing machine comprising a receptacle for the wash water, adish basket therein and means for spraying wash water on the dishes inthe basket, comprising a spray pipe provided with a longitudinal seriesof spray openings and at one end with an end wall, awater lifting pumpcommunicating with the other end of said spray pipe, a valve sleevesurrounding said spray pipe and movable endwise thereof and providedwith ports to register with said spray openings, said valve sleeve beingprovided with a closed end wall between which and the end Wall of thespray pipe is formed a pressure chamber, the end wall of the spray pipebeing perforated to permit passage of water from the spray pipe to thepressure chamber, a headed bolt extending loosely through the end wallof said sleeve and connected to said s ray i e and a compression sprininterp sed b dtiveen the head of said bolt an the end of said valvesleeve. a

9, A dish washing machine comprising a receptacle for the wash water, adish basket therein and means for spraying wash water on the dishes inthe basket, comprising a spray pipe provided with a longitudinal'seriesof spray openings and at one endwith an end wall, a water lifting pumpcommunieating with the other end of the spray. pipe, a valve sleevesurrounding said spray pipe and movable endwise thereof and providedwith ports to register with said spray openings, said valve sleeve beinprovided with a closed endwall between an 10h andthe end wall of thespray pipe is formed a pressure chamber, the end wall of the spray pipebeing perforated to permit the passage of water from the spray pipe tothe pressure chamber, and a stop carried by the valve sleeve to engageshoulders on the spray pipe to limit the opening and closing movementsof said valvesleeve.

10. A dish washing machine provided with a spray pipe having a series ofspray openings, and valve means for controlling the discharge of waterfrom said spray pipe comprising a ported sleeve fitted over said spraypipe, yielding means acting on thesleeve to hold it in its closedposition and means adapted to be acted u on by pressure within said pipeto shift said sleeve on the pipe against the action of said yieldingmeans to open the spray openings.

11; A dish washing machine comprising a receptacle for wash waterprovided with a swinging lid, a dish basket therein, a spray pipe abovethe basket and supported on said li and a pump within the casing havingan eduction pipe to which said spray pipe is connected by a rotativejoint, whereby the aplray pipe may be swung upwardly with the 12. Adishwashing machine comprisin a receptacle for the wash water provided witha swinging lid, a dish basket therein,

on said lid, and a pump having an eduction pipe to which said spray pipeisconnected by a rotative joint, whereby the spray pipe may receptaclefor the wash water, provided with a swinging lid, a dish basket therein,and a water lifting pump with means to operate itand provided with anupwardlyextending fixed eduction pipe, a horizontal header extendingtherefrom and arranged at an angle thereto beneath the hinged edge ofthe lid, and connected to the eduction pipe by a retative joint, andspray pipes extending from said header over the basket and supported attheir outer ends from said lid, whereby the spray pipes may be swungupwardly and downwardly with the lid.

14. A dish washing machine comprising a casing to receive the washwater, a dish basket therein, said casing being formed at one side toprovide a well, the bottom wall of the casing inclining from the otherside of the casing toward said well, a pump in the well, spraying meansconnected to thepump for discharging water upon the dishes in thebasket, said inclined bottom wall being formed at the base thereof witha depression, a pan removably seated in said depression, and aseparating screen between the pan and said well through which water isdrained from the pan to the well.

15. A dish washin machine comprising a casing to receive t e wash water,a dish basket therein, said casin being formed at one side to provide awel the bottom wall of the casing inclining from the other side of thecasing toward said well, a pump in the well, spraying means connected tothe pump for discharging water upon the dishes in the basket, saidinclined wall being formed at the base thereof vwith a depression, a panremovably seated in said depression, a plate dividing the well from thelower part of the casing and extending above the level of the pan, thesaid plate and adjacent wall of the pan being perforated, for thepurpose set forth.

In testimony, that I claim the foregoing as my invention I afiix mysignature in the presence of two witnesses, this 1st day of June, A. D."1914.

JOHN THOMAS McGRATH. Witnesses:

I F. J. BAESK,

N. MCDERMO'IT.

